气升式内循环蜂窝陶瓷反应器降解2,4-二氯酚的研究

Treatment of a 2,4-Dichlorophenol Contaminated Wastewater in an Air-lift Inner-loop Bioreactor

从以 2 ,4 二氯酚 (2 ,4 DCP)长期驯化的好氧活性污泥中分离出一株以 2 ,4 DCP为唯一碳源的菌种 ,将这种菌固定在气升式内循环蜂窝陶瓷反应器内 ,研究了此反应器在半连续流运行时 ,对 2 ,4 DCP单基质及其与苯酚共基质时对污染物的降解情况及降解动力学 .结果表明 ,2 ,4 DCP单基质时 ,反应器对氯酚的去除效果随着实验次数的增加而加快 ;2 ,4 DCP与苯酚共基质时 ,苯酚的降解速率随着半连续流实验次数的增加而加快 ,而氯酚的降解速率则表现出下降的趋势 .此外 ,还研究了此反应器在连续流运行时对 2 ,4 DCP的降解 ,水力停留时间为6h ,进水 2 ,4 DCP浓度为 6 9～ 1 0 2 4mg/L ,系统稳定状态对 2 ,4 DCP平均去除率为 96 5 % .运行中间断性以乙酸钠和蛋白胨作碳源替代 2 ,4 DCP 。

An air lift inner loop bioreactor packed with honeycomb like ceramic carrier was immobilized with a 2,4 Dichlorophenol degrading pure culture and was investigated to degrade 2,4 Dichlorophenol and phenol. In fed batch operation mode, 2,4 DCP biodegradation rate increased with run numbers and followed zero order kinetics model when it existed alone, but when 2,4 DCP was present in the mixture with phenol, phenol degradation rate had an apparent trend to increase whereas 2,4 DCP removal rate became slower and slower. In continuous operation, 2,4 DCP at the concentration ranged from 6 9 to 102 4 mg/L could be degraded well at the dilution rate of 0 16h -1 and the average removal percentage was 96 5%. Carbon sources changed from 2,4 DCP to acetate sodium and peptone in the course of operation for 12 days did not cause the bacteria loss the DCP degrading ability.